I would guess money is a frequent issue, plus visa and other family obligations such as other siblings great grandparents. Health issues too since grandparents are older than in previous times.

None of those qualify as dysfunction in my book.

Apologies in the advance for the (slight) moving of the goal posts, but to me the problems you mention do point out to very dysfunctional aspects of modern life and the common family structures:

- "Older grandparents" is a sign that people are waiting too much to have their own kids.

- "Other family obligations", like what... Work? Perhaps we should rethink our globalized, modern economy that makes dual-income families a necessity. I really hope that by the time my kids get to have their kids, my wife and I are in condition to dedicate ourselves to help them as much as our own parents helped us.

- "Visa issues" is mostly an American thing, which unfortunately I also I am very familiar with (lived in the US before coming to Germany). The US is only going to solve the Milton Friedman dilemma: it can be either a country of Open Borders, or it can be a Welfare State. Until it tries to be both, it is doomed to these catastrophic policies.

Yeah Brazil at least has Mercosur. It's pretty crazy North America doesn't have something similar considering capital can mostly freely flow between NAFTA countries.

Why do you assume "dysfunctional"? Flying costs money. Having apartment big enough to accommodate 3 adults plus one or two kids costs money. Family members have to work too. There is no black and white here.

- The grandparents have jobs of their own with limited vacation time (maybe a US-specific problem, you say you are from Brazil)

- Does either side of the family have enough money to fund cross-country travel more than once a year for a week at a time?

You can fly from Greece to Germany for less than 50€ (Ryanair, Easyjet)

My parents are retired/semi-retired. When they come, it's usually during the summer (here)